Never let your girlfriend, or anyone else touch your firearms, explosives or computer equipment. I also spent several hundred bitcoins for new computer motherboard and HDD that I eventually never used and is still new after 14 years. It was adequate back then, but if I had not spent the coins I would be in TOP5 richest man in my country.
Well, that's a thing in the past now and the good thing still you're able to spend it for something dear to you. No one has ever known that Bitcoin will get to this point of breaching $100k and now stable at $90k above.
That guy also must move on. There is no chance that platters of drive are intact and recoverable.
He can't accept that suggestion and that's why he's still on it but there is no other way for him to do, it's necessary to give it up.